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شبکه توزیع نوری
A typical PON consists of an optical line terminal (OLT) at the service provider's central office, a number of optical network units (ONUs) or optical network terminals (ONTs) close to the end-users, and the optical distribution network (ODN) between.
An ODN is mainly composed of fibers and some passive components, which do not require powering.
This kind of WDM- PON can be upgraded easily from the existing TDM-PON architecture without any change in ODN, but it cannot mitigate the problems of low security and high power loss.
* The passive ODN between OLT and ONUs enables the high-reliability of a WDM-PON system.
As mentioned before, a passive optical network (PON) employs end-to-end optical transmission by optical distribution network (ODN), which mainly contains two segments: feeder and distribution.
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